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authorBrecht Van Lommel <brecht@blender.org>2021-09-20 18:59:20 +0300
committerBrecht Van Lommel <brecht@blender.org>2021-09-21 15:55:54 +0300
commit08031197250aeecbaca3803254e6f25b8c7b7b37 (patch)
tree6fe7ab045f0dc0a423d6557c4073f34309ef4740 /intern/cycles/integrator/work_balancer.cpp
parentfa6b1007bad065440950cd67deb16a04f368856f (diff)
Cycles: merge of cycles-x branch, a major update to the renderer
This includes much improved GPU rendering performance, viewport interactivity, new shadow catcher, revamped sampling settings, subsurface scattering anisotropy, new GPU volume sampling, improved PMJ sampling pattern, and more. Some features have also been removed or changed, breaking backwards compatibility. Including the removal of the OpenCL backend, for which alternatives are under development. Release notes and code docs: https://wiki.blender.org/wiki/Reference/Release_Notes/3.0/Cycles https://wiki.blender.org/wiki/Source/Render/Cycles Credits: * Sergey Sharybin * Brecht Van Lommel * Patrick Mours (OptiX backend) * Christophe Hery (subsurface scattering anisotropy) * William Leeson (PMJ sampling pattern) * Alaska (various fixes and tweaks) * Thomas Dinges (various fixes) For the full commit history, see the cycles-x branch. This squashes together all the changes since intermediate changes would often fail building or tests. Ref T87839, T87837, T87836 Fixes T90734, T89353, T80267, T80267, T77185, T69800
Diffstat (limited to 'intern/cycles/integrator/work_balancer.cpp')
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diff --git a/intern/cycles/integrator/work_balancer.cpp b/intern/cycles/integrator/work_balancer.cpp
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+++ b/intern/cycles/integrator/work_balancer.cpp
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+/*
+ * Copyright 2011-2021 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "integrator/work_balancer.h"
+
+#include "util/util_math.h"
+
+#include "util/util_logging.h"
+
+CCL_NAMESPACE_BEGIN
+
+void work_balance_do_initial(vector<WorkBalanceInfo> &work_balance_infos)
+{
+ const int num_infos = work_balance_infos.size();
+
+ if (num_infos == 1) {
+ work_balance_infos[0].weight = 1.0;
+ return;
+ }
+
+ /* There is no statistics available, so start with an equal distribution. */
+ const double weight = 1.0 / num_infos;
+ for (WorkBalanceInfo &balance_info : work_balance_infos) {
+ balance_info.weight = weight;
+ }
+}
+
+static double calculate_total_time(const vector<WorkBalanceInfo> &work_balance_infos)
+{
+ double total_time = 0;
+ for (const WorkBalanceInfo &info : work_balance_infos) {
+ total_time += info.time_spent;
+ }
+ return total_time;
+}
+
+/* The balance is based on equalizing time which devices spent performing a task. Assume that
+ * average of the observed times is usable for estimating whether more or less work is to be
+ * scheduled, and how difference in the work scheduling is needed. */
+
+bool work_balance_do_rebalance(vector<WorkBalanceInfo> &work_balance_infos)
+{
+ const int num_infos = work_balance_infos.size();
+
+ const double total_time = calculate_total_time(work_balance_infos);
+ const double time_average = total_time / num_infos;
+
+ double total_weight = 0;
+ vector<double> new_weights;
+ new_weights.reserve(num_infos);
+
+ /* Equalize the overall average time. This means that we don't make it so every work will perform
+ * amount of work based on the current average, but that after the weights changes the time will
+ * equalize.
+ * Can think of it that if one of the devices is 10% faster than another, then one device needs
+ * to do 5% less of the current work, and another needs to do 5% more. */
+ const double lerp_weight = 1.0 / num_infos;
+
+ bool has_big_difference = false;
+
+ for (const WorkBalanceInfo &info : work_balance_infos) {
+ const double time_target = lerp(info.time_spent, time_average, lerp_weight);
+ const double new_weight = info.weight * time_target / info.time_spent;
+ new_weights.push_back(new_weight);
+ total_weight += new_weight;
+
+ if (std::fabs(1.0 - time_target / time_average) > 0.02) {
+ has_big_difference = true;
+ }
+ }
+
+ if (!has_big_difference) {
+ return false;
+ }
+
+ const double total_weight_inv = 1.0 / total_weight;
+ for (int i = 0; i < num_infos; ++i) {
+ WorkBalanceInfo &info = work_balance_infos[i];
+ info.weight = new_weights[i] * total_weight_inv;
+ info.time_spent = 0;
+ }
+
+ return true;
+}
+
+CCL_NAMESPACE_END